scrollZoom performance issues since 2.0.0-rc.2

[secretwpn]

I don't have rights to reopen the #5912 so creating a follow-up issue

Here's a demo: https://codesandbox.io/s/plotly2-performance-hovermode-0hf9z?file=/src/index.js

It is set to run with Plotly 2.0.0-rc.1 and the zoom is smooth like butter
But change it to rc.2 or any fresher version and try zooming in with mouse wheel some good amount - after certain point it will become unusably sluggish

[archmoj]

Please note that the default hovermode is 'closest' in v2.
Could you please try setting hovermode: 'x' in the layout?

[secretwpn]

@archmoj Yes, I'm aware of that and hovermode is explicitly defined in layout properties of my demo.

Also this is critical for my app to have hovermode: 'closest' and the point is - it did work with this exact hovermode just fine in rc.1

The demo also has an illustration on how performance differs with newer plotly version on different kind of data - randomized vs sampled from test system.

[shreeramk]

@secretwpn With scattergl and hovermode set to closest, I m seeing slowness as well.
@archmoj please help us here.

[archmoj]

Here is changelog diff between rc1 and rc2:
c74be05

Could you please investigate if this is a side effect of #5632?

[gvwilson]

Hi - we are trying to tidy up the stale issues and PRs in Plotly's public repositories so that we can focus on things that are still important to our community. Since this one has been sitting for several years, I'm going to close it; if it is still a concern, please add a comment letting us know what recent version of our software you've checked it with so that I can reopen it and add it to our backlog. Thanks for your help - @gvwilson